Struct ClassDesc 

#[repr(C)]
pub struct ClassDesc {
    pub name: FfiStr,
    pub methods: *const MethodDesc,
    pub methods_len: usize,
    pub drop: Option<extern "C" fn(opaque_ptr: *mut c_void)>,
    pub traverse: Option<extern "C" fn(opaque_ptr: *mut c_void, visit: PluginVisitFn, visit_ctx: *mut c_void) -> i32>,
}

Description of a plugin-defined class; one entry per class in ModuleDesc::classes.

Fields

name: FfiStr

Class name as seen from generic code (e.g. "Counter").

methods: *const MethodDesc

Pointer to methods_len contiguous MethodDesc entries.

methods_len: usize

Number of entries in methods.

drop: Option<extern "C" fn(opaque_ptr: *mut c_void)>

Destructor for the plugin’s opaque per-instance state, called by the host with the *mut c_void installed via instance_set_opaque when a plugin-backed instance is garbage-collected. May be null if the plugin manages the lifetime itself (rare).

traverse: Option<extern "C" fn(opaque_ptr: *mut c_void, visit: PluginVisitFn, visit_ctx: *mut c_void) -> i32>

GC traversal callback, called during the mark phase for each live plugin-backed instance. May be null if the opaque struct holds no GenericValues. This is PluginTraverseFn spelled out inline - cbindgen only renders a nullable C function pointer for an inline Option<fn>, not through the alias.